ANSYS冰丸穿越高温炉膛的传热过程模拟
毕业论文关键词 电站锅炉，炉膛，吹灰，冰丸，传热
Title Heat transfer process simulation of Ice pellets through high-temperature furnace
Abstract In China the main fuel of power plants is coal which contains high ash content and sulfur content 锄d has low ash fusion temperature．In the case that in the furnace the local atmosphere is reductive or the load is too high or the air dynamics is disordered ， slagging will be easily induced．Worsely, it will lead to high temperature erosion on the heating surfaces．Slagging in the furnace affects the heat transfer efficiency of the heating surfaces and causes the decreasing in the thermal efficiency of the boiler ． In the operation process ， ash ． disposal(or slag．disposal)becomes a critical problem．The existing ash sootblowers take the advantage of momentum,and have an adverse effect on the safety and efficiency of the boiler operation. The main advantage of ice pellets ash technical is ice pellets’ absorbing heat when dissolved. It has thermal stress to damage slag layer, so as to achieve the purpose of ash, and have small impact of kinetic energy on the boiler. This paper studies the heat transfer process of ice pellets after launching when flying in the furnace. First we need to establish the heat exchanger model when ice pellets flying in the furnace. Then we use numerical simulation and VB programming means to simulate the process of the heat exchanger. Finally results of numerical simulation are given as well as the thermal stress distribution inside the ice pellets.
Keyword Power plants，furnace，ash-disposal，ice pellet，simulate
1 绪论.. 7
1．1 炉膛结渣概述 .. 7
1．1．1 炉膛结渣的分类 8
1．1．2 炉膛结渣的危害 8
1．1．3 炉膛结渣的防止 9
1．2 炉膛吹灰概述 .. 9
1．2．1 设置吹灰器的必要性.. 9
1．2．2 现有炉膛吹灰器 9
1.2.3 吹灰效果比较 10
2 理论基础 . 12
2.1 冰丸除灰. 12
2.2 FLUENT 简介 13
2.2.1 FLUENT 的功能及特点 .. 13
2.2.2 FLUENT 的分析过程. 14
2.3 ANSYS 简介.. 16
2.4 本文的主要工作 16
3 模拟思路与设计 18
3.1 传热和应力分析模型 .. 18
3.2 模拟设计 18
3.2.1 fluent 软件模拟 18
3.2.2 ANSYS 软件模拟 . 19
3.2.3 VB数值模拟 . 21
4 实验数据及处理 22
4.1 fluent 数据处理 22